IEC 61788-13:2012 describes considerations for the measurement of hysteretic loss in Cu\/Nb-Ti multifilamentary composites using DC- or low-ramp-rate magnetometry. This international standard specifies a method of the measurement of hysteretic loss in multifilamentary Cu\/Nb-Ti composite conductors. Measurements are assumed to be on round wires with temperatures at or near 4,2 K. DC or low-ramp-rate magnetometry will be performed using either a superconducting quantum interference device or a vibrating-sample magnetometer. Extension to the measurement of superconductors in general is given in Annex. This second edition cancels and replaces the first edition published in 2003. It constitutes a technical revision. Modifications made to the second edition extend to the measurement of superconductors in general, in various sample sizes and shapes, and at temperatures other than 4,2 K, and use the word “uncertainty” for all quantitative statistical expressions to eliminate the quantitative use of “precision” and “accuracy”.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 6<\/td>\n | English CONTENTS <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 4 General specifications 4.1 Target uncertainty 4.2 Uncertainty and uniformity of the applied field 4.3 VSM calibration <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 4.4 Temperature 4.5 Specimen length 4.6 Specimen orientation and demagnetization effects 4.7 Normalization volume 4.8 Mode of field cycling or sweeping <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 5 The VSM method of measurement 5.1 General 5.2 VSM measurement principle 5.3 VSM specimen preparation <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | Figure\u00a01 \u2013 A typical experimental setup of VSM measurement Figure\u00a02 \u2013 Three alternative specimen configurations for the VSM measurement <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 5.4 VSM measurement conditions and calibration 5.4.1 Field amplitude 5.4.2 Direction of applied field 5.4.3 Rate of change of the applied field (sweep rate) 5.4.4 Waveform of the field change 5.4.5 Specimen size and shape correction <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 5.4.6 Allowance for addendum (background subtraction) 5.4.7 Data point density 6 Test report 6.1 General 6.2 Initiation of the test 6.3 Technical details <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | Annex A (informative)cThe SQUID method of measurement <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | Annex B (normative) Extension of the standard to the measurement of superconductors in general <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | Annex C (informative) Uncertainty considerations <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | Table\u00a0C.1 \u2013 Output signals from two nominally identical extensometers Table\u00a0C.2 \u2013 Mean values of two output signals Table\u00a0C.3 \u2013 Experimental standard deviations of two output signals <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Table\u00a0C.4 \u2013 Standard uncertainties of two output signals Table\u00a0C.5 \u2013 Coefficient of variations of two output signals <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Superconductivity – AC loss measurements. Magnetometer methods for hysteresis loss in superconducting multifilamentary composites<\/b><\/p>\n |